how to delete apm session variable from another session

I am trying to get session information for another session. When I use the sessiondump command i get 8 digit session numbers, but when i try to use them in a ACCESS::session data get -sid 12345678 it returns an error that the session doesn't exist. from the above example the sid seems to be a much larger value. I'm curious what the sid value should be?

Then, is there a way to obtain the list of active sessions -- sessionid's as I would like to roll through all active sessions and report some of the session information.

thank you.